Micrometer-feed mechanism.



M. KR ONERT. MI OROMETER FEED MEGHA'KEM. APPLICATION FILED I'EB. 14,1!i10.

Patented May 38, 1912.

a, 00 6 a 2 o s a W/T/VESSES: INVENTOR Max-zraueri UNiTED STATES PATENT onn on.

MAX KRONERT, OF BOZEMAN, MONTANA.

MICROMETER-FEED MECHANISM.

' Specification. of Letters Patent.

Patented May 28,1912.

State of Montana, have invented certain new and useful Improvements in Micrometer- Feed Mechanisms; of which the following is a specification.

My invention is a micrometer adjusting mechanism for use on lathes, milling m'achines, planers, grinders, etc., and the invention generically resides in providing the adjustable feed nutor screw with a double gage plate, one section of which is graduated in one hundredth divisions while the other isgra-duated in 25.4 parts, each of which parts may be sub-divided into ten sub-divisions by a fixedly held vernier scale so that the adjustments made may be read on in both the English system of measure or in the metric system. To render this dual reading quick and easy the vernicr scale plate has a member which has a single Zero indi cating mark to cooperate with one of the scales, while the VUl'lllQl." cooperates with the other.

The invention also resides in those novel details o 1' construction, combination and arrangement of parts, all of which will be first described in detail, then be specifically pointed out in the appended claim, and illustrated in the accompanying drawings, in which I Figure 1, is a face view of-the scales in one form of the invention showing the graduations and hinged zero indicator for the inch scale, swung up to expose the vernier for the metric scale. Fig. 2, is a side elevation thereof. Fig. 3, is a detail view of a modification of the hinged indicator. Fig. 4, is a detail view showing a modified way of graduating the scale 5.

'In the drawings in which like lettersand numerals of reference indicate like parts in all of the figures, 1 is the feed or adjusting screw of a machine of any type employing micrometer adjustments, and 2'is the micrometer member which has rotary movement, and which may be clamped to' the screw 1 by a set screw 3. On the nut sleeve 2 is a plate having a pair of bevel-faced gage ring portions 4 and 5 which is fixed and turns with and as a part of the sleeve 2.

Application filed February 14, 1910. Seria1 No. 543,716.

portion 2. The smaller ring portion 4 is graduated into one hundred divisions to represent thousands of an inch (the screw 1 while the scale 5 is sub-divided into 25.4 parts, the corresponding metric divisions to division of the scale 5 is further sub-di. vided into ten parts by a Vernier scaleG on a plate 6 fixed to the frame 10 of the machine.

'Hinged to the scale plate 6 is anindicator plate 7 having a single zero mark 8 to co-act with the scale 4. The scale ring 4 which the bevel edge 7 of the plate 7 rests (see dotted lines in Fig. 2) when readings of the scale 4 are taken and which may be swung up out 'of the way (see full lines in Fig. 2) when the scale 5 and its Vernier are to be read. The ring 5 also has an annular surface 5 to permit the Vernier plate to abut the same, as shown. may be cut out as at 9 so that both scales may be used simultaneously, as shown in Fig. 3.

The graduating marks on the scale 5 are indicated by two sets of numerals, one set running in a clockwise direction and the other set in a counter clockwise direction,as clearly shown in the drawings, so that readings forward or backward may equal facility.

- In operation after the approximate ad justment is made, through the medium of the screw 1, in the I rate adjustments are made by turning the nut sleeve 2, as with the micrometer mechanism now in use. If the sleeve' 2 is turned until say, one division on the scale 4 is indicated, the screw will be advanced one onethousandths of an inch, when the screw 1 is of a pitch of ten threads per inch. The cor responding reading on the scale 5 will then be 2.54 thousandths millimeters, and so on. By sub-dividing each of the divisions of the scale 5 into ten parts, as indicated in Fig. 4, the vernier graduations may be omitted and only a single zero indicating mark used on the plate 6. When the pitch of the feed screw is. more than'ten threads per inch the number of divisions on the scales 4 and 5 are decreased in proportion to the increase in the number of threads. For example, if

The sleeve 2 has a milled finger engaging the pitch of the screw 1 is threads per inch there will be divisions on the scale 4 being of a pitch of ten threads to the inch) the inch graduations of the scale 4. Each.

has a flat circumferential edge 4* against The indicator plate 7 I be had with usual manner, the accuand there will be but 12.7 divisions on the scale 5 and so on. The number of divisions on the scales 4 and 5 bear a fixed relation to the pitches. of the threads of the screw 1 as will be readily understood by those skilled in the art. Again, for example, should the screw 1 have but five threads to the inch then the number of divisions on the scales 4 and 5 will be doubled instead of halved as ferred.

From the foregoing description taken in connection with the accompanylng drawings,

the complete construction, operation and advantages of my invention will be readily understood by those skilled in the art to which the invention appertains. I desire to say, however, that I do not wish to confine the use of my invention to any specific machine and that slight modifications may be made to adapt it for use on any machine Where micrometer ad uStmentS are required.

What I claim is In a device of the character described, a micrometer screw, a micrometer member vmounted on said screw and including a collar and a scale plate having two distlnct concentric scale sections, one of said sections being of greater diameter than the other, a fixed Vernier mounted adjacent to the scale plate section of greater diameter, a hinged member hinged to said Vernier plate to swing over the same and over the larger section of said scale plate, said scale plate having an annular shoulder between the two sections on which the free edge of said hinged member rests, said hinged member having an opening to expose said Vernier plate and the cooperating part of said scale plate, said hinged member having a zero mark to cooperate with said scale plate section of lesser diameter, one of said scale plate sections being graduated according to the English system, and the other of said scale plate sections being graduated according to the metric system.

W. C. GLAWE, AUG. RICHTER. 

